Precipitation during the hottest quarter 0.879835 Sum of monthly Tavg where Tavg >=5 deg C 1.03499 Nitrogen content of soil 1.07214 Carbon content of soil 1.13188 Precipitation during the driest quarter 1.27875 Precipitation during the coldest quarter 1.29802 Precipitation during the wettest quarter 1.37626 Day/night diurnal temperature difference 1.40123 Ratio of precipitation to potential evapotranspiration 1.59272 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.81508 Compound topographic index (relative wetness) 2.05997 Bulk density of soil 2.24006 Available water holding capacity of soil 2.29001 Temperature during the hottest quarter 3.19379 Solar interception 4.60288 Temperature during the coldest quarter 5.61585